Twinkle twinkle little Star

Back when people used to look up at the sky and wonder what all those lights in the sky were, back when so little was known about the processes by which the cosmos is lit, and by which almost everything we are was created... back then eh!

Nowadays we know that those lights in the sky are in fact massive balls of gas, converting hydrogen into helium at their cores though a process of nuclear fusion. Of course this is just a simplistic description of your standard main sequence star, there are many many other stages of stellar evolution, and indeed types of star.

The point is that we now know this. Through a multitude of methods we can determine the composition, size and distance of those stars that we see. They are no longer unfathomable objects in the sky.

That said, nothing beats a close up look. Most of the time stars other than our Sun are mere points of light. However, one of the better known beasties, Betelgeuse, is both large enough (absolutely freakin' huge) and close enough for surface features to be resolved.

So having read through all that, i'd like to direct you to this short article from the Cavendish Astrophysics website where you can read up on the imaging methods used to obtain the pictures of the stellar disk in question. The images don't show much detail - but you have to remember that this object is 430 lightyears away. Thats 27 million times the distance from the Earth to the Sun, so you can forgive it for not looking quite as impressive!

Fun with Earth View

There are all sorts of applets out there that simulate astronomical viewpoints, most of which manage provide a reason to keep procrastinating that little bit longer. Having stumbled across one such thing earlier today, I thought I'd share it.

Earth View allows you to input your own data to gain views of the earth from varying distances, locations and levels of detail. The default setting has a nice night/day sim, lighting up population centres when dark so that they can be seen.

Nifty!

Devils on Mars

Though not of the sort the title may bring to mind, these are of a somewhat less fiery and more dusty variety.

Dust devils form when hot air close to ground level rises through an area of cooler low pressure air above, and are seen all over the world wherever there are flat plains and plenty of dust lying around. Considering Mars meets all the qualifications you may expect to see them there too right?

Right!

On Earth these whirling vortexes of air and dust are typically no larger than three feet in diameter, however on Mars they can be up to fifty times that, big enough even to provide a scare for the rovers currently wandering the surface of the planet.

Here (and in the above link) you can see a fantastic panorama taken from the landing site of one of the aforementioned rovers, and it quite noticeably features quite a few of our friends. I always think images such as these are particularly great as they really help to bring Mars to life, adding real dynamics to the still pictures we usually get back from our interplanetary voyagers.

Scary stuff!

Ever wondered what the end of the world might look like? This shows a cool simulation of one possible scenario.

The reality is we'd have to have our heads buried in the ground not to notice something of this size coming right at us without a fair bit of advance warning. The question is what to do about it!

A dim view

Of a Brown dwarf!

Artwork like this is always inspiring, it really sparks the imagination and allows you to grasp that places like this can actually exist way out there in space. It is teh awesome.

Yeah yeah, Astronomers (and Protostronomers) are usually giant romantics about the universe...